Agilent Technologies 4294A Instruction Manual download pdf (Page 197)

Chapter 7 189

Setting Up the Display of Measurement Results

Monitoring the Test Signal Level (AC)

7. Setting Up the Display of

Measurement Results

Monitoring the Test Signal Level (AC)

You can set a constant signal level through the keystroke sequence [Source] - LEVEL and

also set the signal level for each measuring point within the range of the signal source level

sweep by pressing the

[Start], [Stop], [Center], and [Span] keys. All these settings are related

to the output signal level of the Agilent 4294A's internal oscillator. In most cases, however,

the signal level actually applied to a DUT differs from the setting applied to the signal

source because some electrical loss occurs between each test terminal and the DUT.

The Agilent 4294A provides a feature that allows you to monitor both the voltage and

amperage values of the test signal level actually applied to the DUT, whether you measure

the signal source level by voltage or current. This feature is called “test signal level

monitor.”

Monitoring the Test Signal Level on a Real-time Basis

For real-time monitoring, the Agilent 4294A provides two fields in the lower area of the

LCD: the Test Signal Voltage Level Monitor field (labeled “VAC”) and the Test Signal

Current Level Monitor field (labeled “IAC”). These fields are updated each time a

measuring point is reached during the sweep cycle.

Step 1. Press the

[Display] key to display the Display menu.

Step 2. Press the

OSC MON on OFF key to turn on the test signal level monitor feature (pressing

this key toggles your selection).

Step 3. If the sweep cycle is currently in the hold state, specify the number of sweep cycles (see

“Specifying Sweep Times and Stopping Sweep” on page 114) and then start testing the

DUT by specifying the trigger source (see “Selecting a Method to Start Measurement

(Trigger Source)” on page 111). Alternatively, you can use the continuous sweep mode by

implementing a free run trigger.

NOTE The Agilent 4294A does not monitor the test signal level until you start testing the DUT.

Using the test signal level monitor feature in conjunction with a manual sweep allows you

to both determine the characteristic value and monitor the test signal level at your desired

measuring point. For more information on manual sweep, refer to “Manual Sweep

(Measurement at a Specified Point)” on page 100.

Once you have turned on or off the test signal level monitor feature, that setting is applied

to both Traces A and B.

Softkey Labels Description

OSC MON ON off Indicates that the test signal level monitor

feature is enabled.

OSC MON on OFF Indicates that the test signal level monitor

feature is disabled.

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